Stasis Dermatitis
http://www.skincarephysicians.com/eczemanet/Stasis_dermatitis.html
Developing in the lower legs, this common eczema occurs when circulation becomes sluggish. Poor blood flow causes fluids to build up, and the legs swell. Over time, this build up of fluids affects the skin, causing a rash that usually itches, painful sores, as well as thinning and discolored skin. Effective treatment involves treating not only the dermatitis but the circulatory problem as well.